Answer Posted / santosh raikar

Daught is nothing but the pressure difference between
furnace and atmosphere. there is two types of daught, one is
natural circulation and second is forced circulation. in
natural circulation the flue gases passes due to natural
pressure gradient exist due to temp and density difference.
in forced circulation a mechanical device is used to create
the pressure gradient, it may be fan/blower. and the
position also decide the type. if it is placed after the
furnace then it is termed as induced draught. and if it is
placed before the furnace then it will termed as forced daught.

this daught is to make to escape the flue gases from the
systum. in boiler force daught is used.

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